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Questions and Answers
How many different forms of a D-monosaccharide are present, at equilibrium, in an aqueous solution of the monosaccharide?
How many different forms of a D-monosaccharide are present, at equilibrium, in an aqueous solution of the monosaccharide?
- two
- three (correct)
- one
- no correct response
Which of the following structures represents a beta-monosaccharide?
Which of the following structures represents a beta-monosaccharide?
- CH2OH HO -OOH OH OH OH HO OH (correct)
- CH2OH HO - OOH OH OH OH
- HOCH2 OH OH OH
- no correct response
Which carbon atom, by number, is the anomeric carbon atom in the structure CH2OH -OOH?
Which carbon atom, by number, is the anomeric carbon atom in the structure CH2OH -OOH?
- carbon 4 (correct)
- no correct response
- carbon 2
- carbon 3
The cyclic forms of an aldohexose are based on a ring system containing:
The cyclic forms of an aldohexose are based on a ring system containing:
Which of the following types of monosaccharides have cyclic forms that involve a five-membered ring?
Which of the following types of monosaccharides have cyclic forms that involve a five-membered ring?
Who was Walter Norman Haworth and what was his contribution to chemistry?
Who was Walter Norman Haworth and what was his contribution to chemistry?
A Haworth projection formula specifies the three-dimensional structure of a cyclic form of a ______.
A Haworth projection formula specifies the three-dimensional structure of a cyclic form of a ______.
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Study Notes
Quick Quiz on Carbohydrates
- Equilibrium in aqueous solutions of D-monosaccharides presents three different forms.
- The structure representing a beta-monosaccharide includes CH2OH, HO, -OOH, and OH groups.
- The anomeric carbon in the specified structure is carbon 4.
- The cyclic forms of an aldohexose consist of a ring system made up of 5 carbon atoms and 1 oxygen atom.
- Aldopentoses and ketohexoses have cyclic forms that utilize a five-membered ring.
Walter Norman Haworth
- Walter Norman Haworth (1883-1950) was a British carbohydrate chemist and developer of Haworth projection formulas.
- He contributed significantly to the understanding of cyclic glucose structures.
- First to synthesize vitamin C.
- Shared the 1937 Nobel Prize in Chemistry for his work.
Haworth Projection Formulas
- Ability to convert Fischer projection formulas to Haworth projection formulas is essential.
- Haworth projection formulas provide a two-dimensional representation indicating the three-dimensional structure of cyclic monosaccharides.
- In Haworth projections, the hemiacetal ring is viewed "edge on", with the oxygen atom positioned differently depending on ring size: at the upper right for six-membered rings and at the top for five-membered rings.
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